﻿using 通讯工具;

class Program
{
    static void Main(string[] args)
    {
        Mobile m = new Mobile("123456789");
        m.ShowSelfNumber();
        m.Calling();
        m.SendMessage();
        m.Offset();

        FixTelephone f = new FixTelephone("987654321");
        f.ShowSelfNumber();
        f.Fax();
        f.Offset();
        
    }
}
